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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	$ 5,535,212	$ 5,496,718
Securities Available for Sale, Gross unrealized gains	4,993	11,570
Securities Available for Sale, Gross unrealized losses	634,782	593,093
Securities Available for Sale, Fair value	4,905,423	4,915,195
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	114,086	97,741
Securities Available for Sale, Gross unrealized gains	722	1,581
Securities Available for Sale, Gross unrealized losses	1,670	1,514
Securities Available for Sale, Fair value	113,138	97,808
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	202,764	203,533
Securities Available for Sale, Gross unrealized gains		79
Securities Available for Sale, Gross unrealized losses	3,730	2,200
Securities Available for Sale, Fair value	199,034	201,412
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	2,401,546	2,440,411
Securities Available for Sale, Gross unrealized gains	743	2,734
Securities Available for Sale, Gross unrealized losses	357,044	329,279
Securities Available for Sale, Fair value	2,045,245	2,113,866
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	2,748,086	2,683,872
Securities Available for Sale, Gross unrealized gains	3,528	7,176
Securities Available for Sale, Gross unrealized losses	265,878	253,576
Securities Available for Sale, Fair value	2,485,736	2,437,472
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	45,230	47,661
Securities Available for Sale, Gross unrealized losses	3,357	3,376
Securities Available for Sale, Fair value	41,873	44,285
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	23,500	23,500
Securities Available for Sale, Gross unrealized losses	3,103	3,148
Securities Available for Sale, Fair value	$ 20,397	$ 20,352

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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